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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

8477 results found.

  1. GRB 060614: Swift detection of a burst with a bright optical and X-ray counterpart
  2. GRB060602A: Swift/UVOT upper limits
  3. GRB 060607: Swift detection of a burst with bright optical counterpart
  4. GRB060605: Spectral Observations and Redshift
  5. GRB 060605: Swift detection of a burst with optical counterpart
  6. GRB060604: Swift/UVOT detections
  7. GRB 060604: redshift
  8. GRB 060604: Swift detection of a burst with possible optical counterpart
  9. GRB 060602B: Swift detection of a burst
  10. GRB060602B: Watcher observations - no OT candidate
  11. GRB060602B: BOOTES-IR candidate afterglow
  12. GRB 060526: Refined analysis of the Swift-BAT burst
  13. GRB 060526: Swift/XRT Team refined analysis
  14. GRB 060526: Continued emission for the Swift burst
  15. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  16. GRB 060522: Swift-BAT Refined Analysis
  17. GRB 060522: REM NIR observations
  18. GRB 060522: TNG optical observations
  19. GRB 060515: Swift/XRT Team refined analysis
  20. GRB 060515: Super-LOTIS Observations
  21. GRB060515: Swift/UVOT initial observation
  22. GRB 060515: TAROT optical observation
  23. GRB 060512: 1.54m Kuiper Observations
  24. GRB 060505 - OT candidate + galaxy spectrum
  25. GRB 060512: Swift detection of a burst with an optical afterglow
  26. GRB060510B : Faulkes North Telescope detection
  27. GRB 060510b: Gemini NIR observations
  28. GRB 060510b: NIR observations
  29. GRB 060510B: MDM Observations and candidate OT
  30. GRB 060510B: Swift detection of a burst
  31. GRB060502B: improvement in the XRT afterglow position
  32. GRB 060507: Swift/UVOT Upper Limits
  33. GRB 060507: MDM Optical Upper Limit
  34. GRB 060505: Swift XRT Team Refined Analysis
  35. GRB060425: new MASTER survey method
  36. GRB 060502B MDM Follow-up Observation
  37. GRB060502B: correction to XRT position
  38. GRB 060501: P60 Observations and Candidate Retraction
  39. GRB 060502B: MASTER optical observations
  40. GRB 060502: P60 Afterglow Confirmation
  41. GRB 060501: MDM Observations
  42. GRB060501: Super-LOTIS observations
  43. GRB060501: P60 imaging and afterglow candidate
  44. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  45. GRB060428B: Swift XRT Team refined analysis
  46. GRB 060428B: Xinglong I-band limit
  47. GRB 060428B: KAIT observations
  48. GRB060428A: Swift/UVOT observations.
  49. GRB 060428b : Kiso R-band limit
  50. GRB060427:MASTER optical limit
  51. GRB 060428b: Optical afterglow candidate
  52. GRB 060428B: Swift detection of a burst
  53. GRB 060427: NIR observations
  54. GRB 060428: Swift detection of a burst
  55. GRB 060427: Swift/UVOT upper limits.
  56. GRB060425:MASTER survey observations
  57. GRB 060427: Swift detection of a burst
  58. OT 060420: Likely Not a New Cosmic Transient
  59. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  60. GRB060421: Swift/UVOT observations
  61. GRB(?)060421:MASTER optical limit
  62. GRB(?) 060421: Swift detection of a burst
  63. GRB 060418, SMARTS optical/IR afterglow observations
  64. GRB060418 : LT optical afterglow observation
  65. GRB 060418: REM candidate afterglow
  66. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  67. GRB060413: Swift/UVOT upper limits
  68. SGR 1900+14: Swift detection of an outburst
  69. GRB 060413: Refined analysis of the Swift-BAT burst
  70. GRB 060413: No Optical Afterglow in Swift/UVOT TDRSS Data
  71. GRB 060403: Refined analysis of the Swift-BAT burst
  72. GRB 060403: Swift detection of a burst
  73. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  74. GRB 060322: Confirmation of Swift XRT afterglow
  75. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  76. GRB060323: NOT optical observations
  77. GRB 060322: Swift XRT afterglow candidate
  78. GRB 060323: optical afterglow confirmed
  79. GRB 060323: Optical Observations
  80. GRB 060323: Tautenburg OT candidate retraction
  81. GRB 060323: optical observations at TNG
  82. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  83. GRB 060323: Swift/XRT position
  84. GRB 060322: Swift-BAT detection of a 200-sec burst
  85. GRB 060319: WHT K-band candidate afterglow
  86. GRB060319 : Liverpool Telescope optical limit
  87. GRB060319: MASTER optical observation
  88. GRB 060319: Swift detection of a burst
  89. GRB 060313: early afterglow NIR upper limits with REM
  90. GRB060313: SSO 40inch Observations
  91. GRB 060313: PROMPT Observations
  92. GRB060313:Gemini South Observations
  93. GRB060313: optical observations of the afterglow candidate
  94. GRB 060313: Swift-BAT detection of a bright short hard burst
  95. GRB060312: Swift UVOT observation
  96. GRB 060306: Swift-BAT refined analysis
  97. GRB 060306: Swift detection of a bright burst
  98. GRB 060223B: Swift XRT possible afterglow
  99. GRB 060218/SN 2006aj: ABT observations
  100. GRB 060218: rebrightening

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